What did he do wrong?
Well he changed your HDD key to his HDD key, and because the 120Gb isn't locked, and the original has a different key, its fucked!
Your only hope now is to mod it or to lock your original/120Gb with his key (With the 120Gb you'd need to use HDD Driver or similar to copy over the dashboard).
I got an error 6 when loading with the
120 hdd in ur box.
Its not locked, DUH...
I put it on my box, ran config
magic, and wrote down the unique hdd key.
Thats his EEPROM HDD key, pfft!
I ran ur box with original hdd, ran config magic, and did on
the fly eeprom editing and changed the unique hdd key
to the one i wrote down.
He changed your EEPROM to his EEPROM, big mistake, should do it to the (Ahem) hard drives not the EEPROM...
Tried booting with 120 gig
hdd and got error 6, tried botting with original hdd
and got error 6.
Well the 120Gb's not locked, and the original now has a mismatched key, doofus...